PDF malware analysis — malicious · c7c182f958fab529

MALICIOUS

PDF

4.0 KB

MD5: ddf45f27666b9c119a77160e19c52764 SHA-1: 2ffac19e2d321dfc6faa6e662b1023d2a16775e1 SHA-256: c7c182f958fab529fa99acb1a8d52d09226856276a17ac7eda17ae4e434496a0

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, with high-confidence heuristics indicating the use of eval() and String.fromCharCode for obfuscation. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript streams, named javascript_obj111611_000.js and javascript_obj111612_001.js, are likely responsible for downloading and executing a second-stage payload, although their exact contents could not be fully deobfuscated.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `3dc8aea2967ed88f6b21ca318c16c3766233db3e2ba32a78827822f44e4b7e9b`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	257 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `250572c083d28ba88d210a488486457a9bf6786e96a7dbf4b5acb42d014a420b`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x267	5596 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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